Aaron Ballman ac77dcd764 Allow a double-underscore spelling of Clang attributes using double square bracket syntax. ...

This matches a similar behavior with GCC accepting [[gnu::__attr__]] as a alias for [[gnu::attr]] in that clang attributes can now be spelled with two leading and trailing underscores.

I had always intended for this to work, but missed the critical bit. We already had an existing test in test/Preprocessor/has_attribute.cpp for [[clang::__fallthrough__]] but using that spelling would still give an "unknown attribute" diagnostic.

llvm-svn: 346547

2018-11-09 19:37:18 +00:00

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